Survivor; widow (6)
I believe the answer is:
relict
This clue is a double definition.
'survivor' is the first definition.
(I've seen this in another clue)
'widow' is the second definition.
(I've seen this before)
(Other definitions for relict that I've seen before include "Primitive survival; widow (arch.)" , "Remnant" , "Old word for widow" , "Widow - surviving group" , "Widow, surviving partner" .)